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Dividends (Detail) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 $ / shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares
Dividends [Line Items] |  |  |
Dividend declared for common share holders |  | $ 423,023 | $ 344,382
Cash dividend declared per common share (USD per share) | $ / shares |  | $ 0.6669 | $ 0.6063
Preferred shares, Series A |  |  |
Dividends [Line Items] |  |  |
Dividends declared for preferred share holders |  | $ 6,194 | $ 6,194
Dividend declared per preferred share (CAD per share) | (per share) | $ 1.2905 |  | $ 1.2905
Preferred shares, Series D |  |  |
Dividends [Line Items] |  |  |
Dividends declared for preferred share holders |  | $ 5,091 | $ 5,091
Dividend declared per preferred share (CAD per share) | (per share) | $ 1.2728 |  | $ 1.2728

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